SAN JOSE – The 17-year-old San Jose teen mauled to death by a San Francisco Zoo tiger on Christmas Day had some alcohol and marijuana in his bloodstream, according to a coroner's toxicology report.

Carlos Sousa Jr. had 0.04 percent ethanol and 6.6 nannograms of Delta-9 THC, the active ingredient in marijuana, in his bloodstream, according to a report performed almost six months ago by NMS Labs in Willow Grove, Pa.

The toxicology report is part of a larger examination of Sousa's death – caused officially by “blunt force injuries of the head and neck (predatory cat bites)” – released Monday by the San Francisco Medical Examiner's Office. Neither the lab nor the Medical Examiner's Office would comment on the report.

But Halle Weingarten, a certified forensic toxicologist who operates Independent Toxicology Services in San Jose, said that “it's absolutely impossible to say” how the drug and alcohol affected Carlos, who was 6 feet 1 inch tall and weighed 272 pounds.

“This doesn't tell you how much he smoked, only that he had smoked it recently, probably within the last two hours,” said Weingarten, Santa Clara County's chief crime lab toxicologist for 20 years before she retired. “You just don't know what individual tolerances are. While alcohol can increase risk-taking behavior, pot usually mellows people out.”

As for alcohol, Carlos' system had half the amount of what is considered illegal for an adult driver, which is 0.08 percent.

Carlos and San Jose brothers Kulbir, 24, and Paul Dhaliwal, 19, were at the San Francisco Zoo on Christmas Day when a Siberian tiger named Tatiana leapt out of its grotto and attacked them. Sousa died and the Dhaliwal brothers were injured. Police shot Tatiana dead. There were allegations the trio had been taunting the tiger, but an investigation did not produce evidence of wrongdoing.

The mauling, which attracted national media attention, revealed the fence at the zoo's tiger enclosure was four feet shorter than industry standards. The zoo spent $1.7 million in safety renovations, and the fence stands at 16.4 feet.

The Dhaliwals and Sousa's family have filed claims against the city of San Francisco and the zoo. The city has denied those claims, setting the stage for lawsuits to be filed.

“We already know he had a very low amount of marijuana,” said Michael Cardoza, an attorney representing the Sousa family. “But it's totally irrelevant. They are using this to divert people down the primrose path to say, 'See, they were under the influence.' ”

There was little else in the 23-page medical examiner's document that had not been reported. It does note that Sousa's Oakland Raider T-shirt was ripped off and he had puncture wounds to his neck, upper torso, back and skull.